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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1578

He kept yawning in class this morning. That is _____ he stayed up late doing his homework last night.

A.why B.how C.because D.whether
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Hekeptyawninginclassthismornin